Study on the High-Spin States and Signature Inversion of Odd-Odd Nucleus <SUP>170</SUP> Ta

DENG Fu-Guo; YANG Chun-Xiang; SUN Hui-Bin; WU Xiao-Guang; LU Jing-Bin; ZHAO Guang-Yi; HAN Guang-Bing; PENG Zhao-Hua; YIN Li-Chang; WEN Shu-Xian; LI Guang-Sheng; YUAN Guan-Ju

Chinese Physics C> 2002, Vol. 26> Issue(5) : 491-500

Study on the High-Spin States and Signature Inversion of Odd-Odd Nucleus ¹⁷⁰ Ta

The Key Laboratory of Beam Technology and Materials Modification of Ministry of Education, Beijing Normal University, Beijing 100875, China2 China Institute of Atomic Energy, Beijing 102413, China3 Institute of Nuclear Technique, Shenzhen University, Shenzhen 518060, China4 Department of Physics, Jilin University, Changchun 130023, China5 Beijing Radiation Center, Beijing 100875, China

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The high spin states of odd odd nucleus ¹⁷⁰Ta were populated via the ¹⁵⁵Gd(¹⁹F,4n)¹⁷⁰Ta reaction with beam energy of 97 MeV provided by the HI-13 tandem accelerator of China Institute of Atomic Energy. Three rotational bands have been pushed to higher spin states and the signature inversion point of the semidecoupled band based on the πh_9/21/2^－⊙νi_13/2 configuration has been observed to be 19.5h. The systematic features of the signature inversion in semidecoupled bands in odd-odd rare earth nuclei were summarized. The systematic differences of signature inversion, especially the difference in the energy splitting between the yrast bands and the semidecoupled bands in odd-odd rare earth nuclei are pointed out and discussed for the first time. It seems that p-n interaction between the odd proton and odd neutron in the odd-odd nuclei plays an important role.

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. LIU Yun-Zuo et al. Phys. Rev.,1995,C52:2514 2. Bark R A et al. Phys. Lett.,1997,B406:193 3. ZHAO G Y et al. Eur. Phys. J.,2000,A9:299 4. Levinton G et al. Phys. Rev.,1999,C60:044309 5. Hojman D et al. Phys. Rev.,2000,C61:0643226. Cardona M A et al. Phys. Rev.,1999,C59:1298 7. ZHANG Y H et al. Eur. Phys. J.,2000,A8:4398. ZHANG Y H et al. Phys. Rev.,1999,C60:044311 9. Bacelar J C et al. Nucl. Phys.,1985,A442:547 10. ZHANG Y H et al. Chin. Phys. Lett,1997,14:409;Eur. Phys. J.,1998,A1:119 11. Lisle J C et al. Nucl. Phys.,1981,A366:281 12. ZHANG Y H et al. Eur. Phys. J.,1999,A5:345 13. Katoch S K et al. Eur. Phys. J.,1999,A4:30714. Kondev F G et al. Nucl. Phys.,1998,A632:473 15. ZHANG Y H et al. High Energy Phys. and Nucl. Phys.,2000,24:369(in Chinese)(张玉虎等.高能物理与核物理,2000,24:369)16. Kreiner A J et al. Phys. Rev.,1989,C40:R48717. Drissi S et al. Nucl. Phys.,1986,A451:313 18. YANG Chun-Xiang et al. Chin. J. Nucl. Phys.,1994,16:223;217

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DENG Fu-Guo, YANG Chun-Xiang, SUN Hui-Bin, WU Xiao-Guang, LU Jing-Bin, ZHAO Guang-Yi, HAN Guang-Bing, PENG Zhao-Hua, YIN Li-Chang, WEN Shu-Xian, LI Guang-Sheng, YUAN Guan-Ju, Study on the High-Spin States and Signature Inversion of Odd-Odd Nucleus ¹⁷⁰ Ta[J]. Chinese Physics C, 2002, 26(5): 491-500.

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Received: 2001-07-05
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Study on the High-Spin States and Signature Inversion of Odd-Odd Nucleus ¹⁷⁰ Ta

Corresponding author: DENG Fu-Guo,

The Key Laboratory of Beam Technology and Materials Modification of Ministry of Education, Beijing Normal University, Beijing 100875, China2 China Institute of Atomic Energy, Beijing 102413, China3 Institute of Nuclear Technique, Shenzhen University, Shenzhen 518060, China4 Department of Physics, Jilin University, Changchun 130023, China5 Beijing Radiation Center, Beijing 100875, China

Received Date: 2001-07-05
Accepted Date: 1900-01-01
Available Online: 2002-05-05

Abstract: The high spin states of odd odd nucleus ¹⁷⁰Ta were populated via the ¹⁵⁵Gd(¹⁹F,4n)¹⁷⁰Ta reaction with beam energy of 97 MeV provided by the HI-13 tandem accelerator of China Institute of Atomic Energy. Three rotational bands have been pushed to higher spin states and the signature inversion point of the semidecoupled band based on the πh_9/21/2^－⊙νi_13/2 configuration has been observed to be 19.5h. The systematic features of the signature inversion in semidecoupled bands in odd-odd rare earth nuclei were summarized. The systematic differences of signature inversion, especially the difference in the energy splitting between the yrast bands and the semidecoupled bands in odd-odd rare earth nuclei are pointed out and discussed for the first time. It seems that p-n interaction between the odd proton and odd neutron in the odd-odd nuclei plays an important role.